JP2789436B2 - Garbage incineration agent - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste incineration agent effective for neutralizing and removing HCl and SOx in exhaust gas generated in a waste incineration facility.

[0002]

2. Description of the Related Art
In actual practice, incinerators operating at municipal waste cleaning factories and industrial waste intermediate treatment factories neutralize and remove hydrogen chloride gas, which causes large amounts of pollution, using lime or caustic soda. is there. This method includes a dry method, a semi-dry method, and a wet method, but mainly the dry method and the semi-dry method are implemented due to construction costs, running costs, and other various reasons. In particular, the semi-dry method in which a drug is added as a slurry is a method excellent in neutralization reactivity.

[0003] Lime and caustic soda used as chemicals in this case have a problem in terms of cost, and at present it is strongly required to reduce them. On the other hand, there has been proposed a method of effectively utilizing the remaining concrete discharged from the mixer and ready-mixed concrete truck of the ready-mixed concrete manufacturing plant and the fresh concrete residue generated by washing the inside of the drum. There is a disadvantage that the number of days is limited.
On the other hand, sludge generated as a by-product during the production of lignin products from the sulfite pulp effluent has no means for effectively using it, and is disposed of in landfill. The use of this industrial waste is also an issue.

[0004]

The present inventors have conducted various studies to solve these problems, and as a result, sludge generated as a by-product during the production of lignin products has been found to be a waste gas generated in garbage incineration facilities. The present inventors have found that the present invention can be an effective refuse incineration agent for neutralizing and removing HCl and SOx therein, and have reached the present invention. The sludge generated as a by-product during the production of this lignin product is mainly composed of any one of calcium carbonate, calcium hydroxide, magnesium carbonate, and magnesium hydroxide, or a mixture thereof, and has a composition suitable as a drug in general. ing.

The present invention, (1) sulphite making the lignin products from the pulp waste solution, a refuse incineration treatment agent consisting of Ca or Mg-based sludge generated as a by-product, (2) the waste incineration agent ( 1) Sludge as calcium carbonate, calcium hydroxide, magnesium carbonate,
Mixture der Lugo Mi incineration agent either, or which like magnesium hydroxide, it relates to.

[0006] The sludge as a refuse incineration agent according to the present invention is generated as a by-product when a lignin product is produced from a sulfite pulp effluent. Sulfite pulp effluents are based on Ca, Na or Mg depending on the chemical used during the cooking step. When producing desalted products using calcium hydroxide and magnesium hydroxide in these effluents, sludge mainly composed of calcium carbonate, magnesium carbonate and unreacted calcium hydroxide and magnesium hydroxide precipitates. . This is used as a garbage incinerator according to the present invention using a solid-liquid separator such as a separator and a decanter.
You get all the sludge.

[0007] A considerable amount of lignin product remains in the sludge. Also, washing water is mixed. However, the sludge is desirably a slurry in terms of storage, transportation, and reactivity, and the incorporation of lignin products and washing water is rather advantageous for obtaining a stable slurry. The concentration of sludge slurry is 5 to 5 in terms of storage, transportation and reactivity.
90% is desirable, and less than 5% is not economical for transportation,
Even if it exceeds 90%, handling during storage becomes difficult. However, powder products can be used because they are uniformly dispersed.

The dose is at least twice the molar equivalent of the generated hydrogen chloride gas (about 4 kg of chlorine gas per ton of municipal waste).
A molar equivalent of 10 times or less is desirable. If it is less than twice the molar equivalent, the neutralization reaction is insufficient and hydrogen chloride gas cannot be collected. Further, even if it is added in excess of 10 times the molar equivalent, the lignin product in the sludge has the merit of being an energy source, but the ash content increases and incineration ash increases. It may be administered to an incinerator or a method of trapping generated gas in slurry may be used. It can also be used in combination with ready-mixed concrete residues or commercially available alkaline chemicals.

[0009]

The present invention will be described below with reference to examples. Ca
The by-products produced during the production of the base lignin product were changed in the degree of washing, and the amounts of the lignin product in the sludge and the sludge concentration were changed to products 1, 2, and 3 of the present invention. In addition, Mg
The by-product at the time of manufacturing the base product was designated as product 4 of the present invention. The products of the present invention have the compositions shown in Table 1, respectively. As a control, a 10% concentration sludge slurry from a ready-mixed concrete factory was used. Table 2 shows the results.

[0010]

[Table 1]

Combustion Test Using the combustion tube type test apparatus shown in FIG. 1, a combustion test was conducted on only the vinyl chloride resin and a combustion test was conducted on a mixture of the vinyl chloride resin and the sludge slurry. In the figure, 1: air 2: flow meter 3: sample 4: heater 5: pump 6: trap 7: exhaust. The higher the reduction rate, the better the effect as a neutralizing agent. Quantitative analysis of gas
Compliant. Test conditions Sample: Vinyl chloride resin with neutralizer added 1
g Burning temperature: 250 ° C Burning time: 30 minutes ○ Stability test The neutralizer was left standing for 2 weeks, and the state when stirred for 1 minute was observed. The state where the precipitation layer was solidified and stirring was impossible was evaluated as x.

[0012]

[Table 2]

[0013]

The product of the present invention has a neutralizing effect on HCl in exhaust gas generated in a garbage incineration facility and a stability.
It is superior to ready-mixed concrete residue and can be an effective garbage incineration agent. In addition, sludge produced as a by-product during the production of lignin products can be effectively used.

[Brief description of the drawings]

FIG. 1 is a flow sheet schematically showing a combustion tube type test apparatus.

[Explanation of symbols]

 1 Air 2 Flow meter 3 Sample 4 Heater 5 Pump 6 Trap 7 Exhaust

Claims (2)

(57) [Claims] 1. A garbage incineration agent comprising Ca or Mg-based sludge generated as a by-product when a lignin product is produced from sulphite pulp effluent. 2. The refuse incineration treatment according to claim 1, wherein the sludge is any one of calcium carbonate, calcium hydroxide, magnesium carbonate, and magnesium hydroxide, or a mixture thereof.